The Olympics has been doing a good job recently of allowing people to revisit the competitions that took place. So of course they would have to bring up rugby 7s.
This piece breaks down some insights by the top Olympic rugby coaches, on how to be an international rugby player. There is some pretty solid, albeit general, information. This is still really cool to listen to. It will at least confirm many things you may have assumed you knew.
https://twitter.com/olympicchannel/status/813140890659278848